docs: def integrate_days(self, days=1.0, verbose=True):
          """Integrates the model forward for a specified number of days.
  
          It convertes the given number of days into years and calls
          :func:`integrate_years`.
  
          :param float days:      integration time for the model in days
                                  [default: 1.0]
          :param bool verbose:    information whether model time details
                                  should be printed [default: True]
  
          :Example:
  
              ::
  
                  >>> import climlab
                  >>> model = climlab.EBM()
  
                  >>> model.global_mean_temperature()
                  Field(11.997968598413685)
  
                  >>> model.integrate_days(80.)
                  Integrating for 19 steps, 80.0 days, or 0.219032740466 years.
                  Total elapsed time is 0.211111111111 years.
  
                  >>> model.global_mean_temperature()
                  Field(11.873680783355553)
  
          """
          years = days / const.days_per_year
          self.integrate_years(years=years, verbose=verbose)